Weather-resistant hot melt adhesive for book binding and preparation process thereof

Abstract

The present invention relates to C09J163, and more specifically, to a weather-resistant hot melt adhesive for book binding and a preparation process thereof. The raw materials of the weather-resistant hot melt adhesive for book binding include polymer inert substances, base materials, aromatic oligomers and phenolic compounds. By mixing polyolefin elastomers with melt flow rates of 1.4-1.8g / 10min and 0.9-1.1g / 10min, not only the viscosity of the obtained hot melt adhesive is improved, but also the adhesive layer quality of the hot melt adhesive is improved, making the adhesive layer softer, and is particularly suitable for binding books with large grams or many pages; 30-40 parts of aromatic oligomers, under the action of phenolic phenolic compounds, further act together with the base material to improve the secondary bond force of the hot melt adhesive when bonding to the book, so that the hot melt adhesive has no carbonization phenomenon and the service life is extended; the raw materials in the hot melt adhesive act together, not only improving the low-temperature brittleness of the hot melt adhesive, making it not easy to crack, and having excellent weather resistance.

Description

Technical Field

[0001] The present invention relates to C09J163, and more specifically, to a weather-resistant hot melt adhesive for book binding and a preparation process thereof. Background Art

[0002] EVA (ethylene-vinyl acetate copolymer) hot melt adhesive is a fusible solid polymer that does not contain water or other solvents. It is solid at room temperature. When the temperature rises to a certain level, the solid melts and becomes a viscous flowing liquid. Due to this characteristic of EVA hot melt adhesive, it is widely used in various fields such as hardware, electrical appliances, toys, cultural supplies, and craft products.

[0003] Patent No. CN113528061A provides a formula and process of EVA hot melt adhesive for book binding, which is used in book binding to improve the peeling resistance and tensile strength of copperplate adhesive. Patent No. CN105802547B provides an EVA hot melt adhesive for book binding, which adds vinylbenzene condensed heterocyclic substances to compound the raw materials, thereby improving the ink resistance and temperature resistance of the EVA hot melt adhesive.

[0004] In the prior art, most of the traditional EVA hot melt adhesive is used for book binding, but EVA hot melt adhesive is easy to carbonize and has poor high and low temperature resistance. Due to the hard adhesive layer, EVA hot melt adhesive cannot guarantee the binding effect for books with high gram weight; due to poor flatness and easy brittle cracking, the effect of EVA hot melt adhesive binding books with many pages is relatively poor. Summary of the invention

[0005] In order to solve the above problems, the first aspect of the present invention provides a weather-resistant hot melt adhesive for book binding, wherein the raw materials of the weather-resistant hot melt adhesive for book binding include a high molecular weight inert substance, a base material, an aromatic oligomer and a phenolic compound.

[0006] As a preferred technical solution of the present invention, the polymer inert substance is coal-based synthetic oil.

[0007] Preferably, the coal-based synthetic oil is selected from one or more of microcrystalline wax, polyethylene wax, and Fischer-Tropsch wax.

[0008] Further preferably, the coal-based synthetic oil is Fischer-Tropsch wax.

[0009] As a preferred technical solution of the present invention, the base material is an olefin polymer.

[0010] As a preferred technical solution of the present invention, the olefin polymer is selected from one or more of ethylene-vinyl acetate copolymer, ethylene-ethyl acrylate copolymer, and polyolefin elastomer mixture.

[0011] As a preferred technical solution of the present invention, the olefin polymer is a polyolefin elastomer mixture.

[0012] As a preferred technical solution of the present invention, the melt flow rate of the polyolefin elastomer mixture is 0.8-2 g / 10 min (190° C. / 2.16 kg).

[0013] Polyolefin elastomer blend

[0014] Polyolefin elastomer (POE) is a short-chain branched thermoplastic elastomer with uniform molecular weight prepared by metallocene catalyst. POE generally includes ethylene-octene copolymer, ethylene-butene copolymer and ethylene-hexene copolymer.

[0015] Preferably, the polyolefin elastomer mixture includes a polyolefin elastomer mixture A and a polyolefin elastomer mixture B.

[0016] Preferably, in the polyolefin elastomer mixture, the weight ratio of the polyolefin elastomer mixture A to the polyolefin elastomer mixture B is (0.5-1.5):(4.5-6).

[0017] More preferably, the melt flow rate of the polyolefin elastomer mixture A is 1.4-2 g / 10 min (190° C. / 2.16 kg), and the melt flow rate of the polyolefin elastomer mixture B is 0.8-1.2 g / 10 min (190° C. / 2.16 kg).

[0018] More preferably, the melt flow rate of the polyolefin elastomer mixture A is 1.4-1.8 g / 10 min (190° C. / 2.16 kg), and the melt flow rate of the polyolefin elastomer mixture B is 0.9-1.1 g / 10 min (190° C. / 2.16 kg).

[0019] In order to overcome the problems encountered by traditional EVA hot melt adhesive when binding books with large grams or many pages, the applicant has found through a large number of experiments that by mixing two polyolefin elastomers with specific melt flow rates, not only the viscosity of the resulting hot melt adhesive is improved, but also the quality of the adhesive layer of the hot melt adhesive is improved, making the adhesive layer softer, and especially suitable for binding the above-mentioned books. The applicant speculates that this may be because polyolefins with a specific melt flow rate can improve the fluidity of the system, thereby affecting the cross-linking properties of the hot melt adhesive, and the large number of side chains in POE also affect the crystallization properties of the colloidal system. In addition, the CH bonds of polyolefins can also undergo specific intermolecular hydrogen bonding with the hydroxyl groups of phenolic compounds. The improvements in the three properties of cross-linking properties, crystallization properties, and intermolecular hydrogen bonding work together to improve the viscosity of the hot melt adhesive while significantly changing the quality of the adhesive layer.

[0020] As a preferred technical solution of the present invention, the aromatic oligomer is selected from one or more of rosin derivatives, terpene resins, and petroleum resins.

[0021] As a preferred technical solution of the present invention, the aromatic oligomer is petroleum resin.

[0022] Preferably, the petroleum resin is hydrogenated petroleum resin.

[0023] Preferably, the raw materials of the weather-resistant hot melt adhesive for book binding include 2-20 parts of high molecular weight inert substances, 30-60 parts of base materials, 30-60 parts of aromatic oligomers and 0.1-0.3 parts of phenolic compounds, measured by weight.

[0024] Further preferably, the raw materials of the weather-resistant hot melt adhesive for book binding include 5-15 parts of high molecular weight inert substances, 35-50 parts of base materials, 30-40 parts of aromatic oligomers and 0.1-0.3 parts of phenolic compounds in parts by weight.

[0025] The second aspect of the present invention provides a process for preparing a weather-resistant hot melt adhesive for book binding, comprising the following steps: (1) mixing; and (2) forming.

[0026] Preferably, the step (1) is specifically as follows: raw materials of the weather-resistant hot melt adhesive for book binding are put into a mixer according to weight, heated to 82-88° C., stirred for 40-70 min at a stirring speed of 25-40 rpm, to obtain a mixture 1.

[0027] The step (2) specifically includes adding the mixture 1 into a twin-screw extruder and extruding the mixture to obtain a weather-resistant hot melt adhesive.

[0028] Compared with the prior art, the present invention has the following beneficial effects:

[0029] Adding 5-15 parts of coal-based synthetic oil, which works together with the base material and aromatic oligomers, can not only adjust the viscosity of the prepared hot melt adhesive, but also shorten the curing time of the hot melt adhesive while ensuring the stability of the hot melt adhesive, so that it has a shorter open time; by mixing polyolefin elastomers with melt flow rates of 1.4-1.8g / 10min and 0.9-1.1g / 10min, not only the viscosity of the obtained hot melt adhesive is improved, but also the quality of the adhesive layer of the hot melt adhesive is improved, making the adhesive layer softer, and is particularly suitable for binding books with a large gram weight or a large number of pages; 30-40 parts of aromatic oligomers, under the action of phenolic compounds, further work together with the base material and calcium carbonate with a particle size of 300-350 meshes to improve the secondary bond force of the hot melt adhesive when bonding with the book, so that the hot melt adhesive does not carbonize and the service life is extended; the raw materials in the hot melt adhesive work together to not only improve the low-temperature brittleness of the hot melt adhesive, making it less prone to brittle cracking, but also have excellent weather resistance. DETAILED DESCRIPTION

[0030] Example

[0031] The raw materials for preparing the compositions in the embodiments are all commercially available, wherein Fischer-Tropsch wax was purchased from Shijiazhuang Maifeng Chemical Technology Co., Ltd., polyolefin elastomer mixture A was purchased from Dow Chemical of the United States with a brand name of 8440 and a melt flow rate of 1.6 g / 10 min (190°C / 2.16 kg), polyolefin elastomer mixture B was purchased from Dow Chemical of the United States with a brand name of 8003 and a melt flow rate of 1.0 g / 10 min (190°C / 2.16 kg), hydrogenated petroleum resin was purchased from Eastman with a brand name of Impera P1504, and phenolic compounds were purchased from BASF with a brand name of 1010.

[0032] Example 1

[0033] This example provides a weather-resistant hot melt adhesive for book binding. The raw materials of the weather-resistant hot melt adhesive for book binding include 10 parts of high molecular inert substances, 42 parts of base materials, 35 parts of aromatic oligomers and 0.2 parts of phenolic compounds in parts by weight.

[0034] The high molecular weight inert substance is coal-based synthetic oil, and the coal-based synthetic oil is Fischer-Tropsch wax.

[0035] The base material is an olefin polymer, and the olefin polymer is a polyolefin elastomer mixture.

[0036] The polyolefin elastomer mixture includes a polyolefin elastomer mixture A and a polyolefin elastomer mixture B.

[0037] In the polyolefin elastomer mixture, the weight ratio of the polyolefin elastomer mixture A to the polyolefin elastomer mixture B is 1:5.

[0038] The aromatic oligomer is a petroleum resin, and the petroleum resin is a hydrogenated petroleum resin.

[0039] This example also provides a process for preparing a weather-resistant hot melt adhesive for book binding, the steps of which are as follows: (1) mixing; (2) molding.

[0040] The step (1) specifically includes putting the raw materials of the weather-resistant hot melt adhesive for book binding into a mixer according to weight, heating to 84° C., stirring for 50 minutes at a stirring speed of 35 rpm, and obtaining a mixture 1.

[0041] The step (2) specifically includes adding the mixture 1 into a twin-screw extruder and extruding the mixture to obtain a weather-resistant hot melt adhesive.

[0042] Example 2

[0043] This example provides a weather-resistant hot melt adhesive for book binding. The difference from Example 1 is that, by weight, the raw materials of the weather-resistant hot melt adhesive for book binding include 7 parts of high molecular inert substances, 38 parts of base materials, 31 parts of aromatic oligomers and 0.15 parts of phenolic compounds.

[0044] This example also provides a preparation process of a weather-resistant hot melt adhesive for book binding, which is the same as that of Example 1.

[0045] Example 3

[0046] This example provides a weather-resistant hot melt adhesive for book binding. The difference from Example 1 is that, by weight, the raw materials of the weather-resistant hot melt adhesive for book binding include 12 parts of high molecular inert substances, 50 parts of base materials, 38 parts of aromatic oligomers, and 0.3 parts of phenolic compounds.

[0047] This example also provides a preparation process of a weather-resistant hot melt adhesive for book binding, which is the same as that of Example 1.

[0048] Example 4

[0049] This example provides a weather-resistant hot melt adhesive for book binding. The difference from Example 1 is that in the polyolefin elastomer mixture, the weight ratio of polyolefin elastomer mixture A to polyolefin elastomer mixture B is 3:6.

[0050] This example also provides a preparation process of a weather-resistant hot melt adhesive for book binding, which is the same as that of Example 1.

[0051] Example 5

[0052] This example provides a weather-resistant hot melt adhesive for book binding. The difference from Example 1 is that the raw materials of the weather-resistant hot melt adhesive for book binding include 20 parts of high molecular inert substances, 48 ​​parts of base materials, 38 parts of aromatic oligomers, and 0.25 parts of phenolic compounds.

[0053] This example also provides a preparation process of a weather-resistant hot melt adhesive for book binding, which is the same as that of Example 1.

[0054] Performance Test:

[0055] 1. Thermal stability test: The weather-resistant hot melt adhesive obtained in Examples 1-5 was subjected to a hot melt adhesive thermal stability test according to GB / T16998-1997, with a test temperature of 150° C. and a test time of 24 h. The results are shown in Table 1:

[0056] Table 1

[0057] Example Thermal stability (150℃, 24h) 1 No yellowing 2 No yellowing 3 No yellowing 4 Yellowing 5 Yellowing

[0058] 2. Book tensile test: 128g coated paper was selected, and 150 pages of coated paper were bound at 170°C using the weather-resistant hot melt adhesive obtained in Example 1, Example 4 and Example 5, respectively, to obtain corresponding book samples. The samples were placed in environment A with a humidity of 50% and a temperature of 25°C, environment B with a humidity of 60% and a temperature of 7°C (low temperature), and environment C with a humidity of 50% and a temperature of 38°C (high temperature). After standing for 72 hours, the first page, the 75th page and the 150th page of each book were taken and subjected to tensile testing using a tensile testing machine. The results are shown in Table 2:

[0059] Table 2

[0060]

[0061] 3. Hot melt adhesive open time test: 128g coated paper was selected, and 50 pages of coated paper were bound at 170°C using the weather-resistant hot melt adhesive obtained in Examples 1-5 to obtain corresponding book samples. The first page of each book was taken and a tensile test was performed using a tensile testing machine. The open time of the hot melt adhesive was recorded when the tensile force was 4.5N / cm. The results are shown in Table 3:

[0062] Table 3

[0063] Example Opening hours(s) 1 26 2 31 3 30 4 35 5 33

Claims

1. A weather-resistant hot melt adhesive for book binding. It is characterized in that The raw materials of the weather-resistant hot melt adhesive for book binding are, by weight, 5-15 parts of high molecular inert substances, 35-50 parts of base materials, 30-40 parts of aromatic oligomers and 0.1-0.3 parts of phenolic compounds; The base material is a polyolefin elastomer mixture; The polymer inert substance is Fischer-Tropsch wax; The polyolefin elastomer mixture comprises a polyolefin elastomer mixture A and a polyolefin elastomer mixture B, wherein the weight ratio of the polyolefin elastomer mixture A to the polyolefin elastomer mixture B is (0.5-1.5):(4.5-6); the grade of the polyolefin elastomer mixture A is 8440, and the melt flow rate is 1.6 g / 10 min; the grade of the polyolefin elastomer mixture B is 8003, and the melt flow rate is 1.0 g / 10 min; The aromatic oligomer is hydrogenated petroleum resin.

2. A process for preparing the weather-resistant hot melt adhesive for book binding according to claim 1, It is characterized in that The steps are as follows: (1) mixing; (2) molding.

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